this conflict, syrian president bashar al-assad has blamed the high civiliadeaths on the rebels themselves, foreign agents and military accidents. >> ( translated ): we do not carry out these acts because we love to spill blood. this battle was forced upon us, and the result is this blood that has been spilled. >> warner: malinowski of human rights watch says the rebels do have abuses to account for, too. >> the overwhelming majority of human rights abuses in this conflict have been committed by the syrian government and its militia allies. that doesn't mean that the rebels have been perfect. >> warner: just today, video surfaced of f.s.a. fces allegedly executing unarmed syrian soldiers, though the veracity of the video could not be verified. still, when it comes to killing civilians, independent observers hold the regime primarily responsible. in late may, more than 100 men, women and children were butchered in the village of houla. a united nations-appointed panel said government forces and loyalist militias were responsible for the massacre. then too, president assad denied his regime'